Given the centrality of the role of objective knowledge, I wish to argue that the rile of subjective mathematical knowledge must also be acknowledged, or else the overall account of mathematics will be incomplete. For subjective knowledge is needed to account for the origins of new mathematical knowledge, as well as, according to the theory proposed, the re-creation and sustainment of existing knowledge. Since objective knowledge is social. And not a self-subsistent emtity existing in some ideal realm, then like all aspects of culture this knowledge must be reproduced and transmitted from generation to generation (admittedly with the aid of artefacts, such as text). According to the social constructivism account, subjective knowledge is what sustains and renews objective knowledge, whether it be of mathematics, logic language. Thus subjective knowledge plays a central part in the proposed philosophy mathematics.